Catalyst System for Selective Polymer Hydrogenation
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Solution Overview
Problem
Existing homogeneous catalysts for hydrogenating unsaturated double bonds in conjugated diene polymers face challenges such as sensitivity to air and moisture, variability in hydrogenation activity, and difficulty in achieving high reproducibility and stability, leading to inefficient polymer hydrogenation and reduced durability and oxidation resistance.
Innovation Solution
A catalyst system comprising a metal complex of Formula (I), an organic lithium compound, and an organic compound with a cyclic structure, which stabilizes the hydrogenation process under moderate temperatures and pressures, allowing for selective hydrogenation of conjugated diene polymers with high yield and reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If homogeneous catalysts are used for hydrogenating unsaturated double bonds in conjugated diene polymers, then hydrogenation activity is improved, but stability and reproducibility deteriorate due to sensitivity to air and moisture
Solution Approach 1:
The patent introduces an organometallic compound as an intermediary substance that mediates between the homogeneous catalyst and the polymer substrate. This intermediary facilitates the hydrogenation reaction while protecting the catalyst from direct exposure to air and moisture, thereby maintaining both high hydrogenation activity and improved stability/reproducibility
Solution Approach 2:
The patent creates an inert reaction environment by using an organometallic compound that forms a protected complex with the homogeneous catalyst. This inert environment shields the sensitive catalyst from air and moisture while still allowing the hydrogenation reaction to proceed efficiently
2Reliability
If heterogeneous catalysts are used for hydrogenating polymers, then stability is improved, but hydrogenation activity deteriorates due to high viscosity and steric hindrance
Solution Approach 1:
The patent changes the physical and chemical parameters of the catalyst system by using homogeneous catalysts in combination with organometallic compounds. This parameter change allows the catalyst to operate effectively in the high-viscosity polymer medium without suffering from the steric hindrance problems that plague heterogeneous catalysts
3Productivity
If severe reaction conditions are applied to achieve effective hydrogenation with heterogeneous catalysts, then hydrogenation yield is improved, but polymer degradation increases
Solution Approach 1:
The patent changes the reaction parameters by using a homogeneous catalyst system with organometallic compounds that enables effective hydrogenation at milder temperatures and pressures. This parameter change achieves high hydrogenation yield while avoiding the polymer decomposition and gelling problems associated with severe reaction conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The catalyst system achieves a high degree of hydrogenation yield and reproducibility, improving the durability and oxidation resistance of polymers while maintaining stability and efficiency, outperforming traditional homogeneous catalysts.
Implementation Method 1
a catalyst system comprising a metal complex of Formula (I), an organic lithium compound and an organic compound having a cyclic structure comprising at least one double bond
Implementation Method 2
an organometallic compound containing transition metal(s), such as nickel, cobalt and titanium, is mixed with an organometallic compound serving as a reductant, such as organo aluminum, organo magnesium and organo lithium
Data Source
AI summary
A hydrogenation catalyst system is provided. The catalyst system includes a metal complex of Formula (I), an organic lithium compound and an organic compound having a cyclic structure including at least one double bond.In Formula (I), M is transition metals. R1, R2, R3, R4 and R5 are the same or different, including hydrogen, C1-8 alkyl, and C1-8 alkoxy, or two of R1, R2, R3, R4 and R5 are linked together to form a ring. X1, X2 and X3 are a cyclic group, hydrogen, chlorine, bromine, alkyl or alkoxy, wherein when one of X1, X2 and X3 is a cyclic group, and the others are the same or different, including hydrogen, chlorine, bromine, alkyl or alkoxy. The invention also provides a selective hydrogenation process utilizing the catalyst system.